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[Discuss-gnuradio] Why no phase ambiguity in digital-bert...
From: |
Ian Holland |
Subject: |
[Discuss-gnuradio] Why no phase ambiguity in digital-bert... |
Date: |
Tue, 13 Apr 2010 14:41:58 +0930 |
Hi All
I have been studying up on the Costas loop, and have a couple of queries as to the benchmark_tx.py and benchmark_rx.py as a result.
Firstly, for BPSK, there should in theory be a 180 deg. phase ambiguity when using a Costas loop. Why does this not seem to occur with the benchmark_rx.py example? Is this related somehow to the PN code introduced by the scrambler.
Secondly, I came across another post in which it was mentioned the Costas loop should only operate on a single sample per symbol. However, as I read the source code, it seems as though it is actually passed sps samples per symbol, where sps > 1. Have I misread something here?
Any help in these matters would be greatly appreciated.
Thanks
Ian.
- [Discuss-gnuradio] Why no phase ambiguity in digital-bert...,
Ian Holland <=
Re: [Discuss-gnuradio] Why no phase ambiguity in digital-bert..., Tom Rondeau, 2010/04/14